191940 has 48 divisors (see below), whose sum is σ = 615552. Its totient is φ = 43776.

The previous prime is 191929. The next prime is 191953. The reversal of 191940 is 49191.

191940 = T₃₄ + T₃₅ + ... + T₁₀₅.

It is a self number, because there is not a number n which added to its sum of digits gives 191940.

It is an unprimeable number.

191940 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 192 + ... + 648.

It is an arithmetic number, because the mean of its divisors is an integer number (12824).

2¹⁹¹⁹⁴⁰ is an apocalyptic number.

191940 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 191940, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (307776).

191940 is an abundant number, since it is smaller than the sum of its proper divisors (423612).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

191940 is a wasteful number, since it uses less digits than its factorization.

191940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 476 (or 474 counting only the distinct ones).

The product of its (nonzero) digits is 324, while the sum is 24.

The square root of 191940 is about 438.1095753348. The cubic root of 191940 is about 57.6839728130.

The spelling of 191940 in words is "one hundred ninety-one thousand, nine hundred forty".